Is a 1:3 dilution the same as a 4x dilution?

Yes, in the parts form used here: 1 part concentrate plus 3 parts water, 4 parts in all, is a 4x dilution factor. Some specs write 1:4 for 1 part in 4 total, so confirm the form before you batch.

Do I add water to the concentrate or concentrate to the water?

Add concentrate to water, slowly. Strong acids and caustic heat up as they dilute; add acid to water, never water to acid. Charge the water first where you can, and mix before sampling.

Can I dilute 50% caustic soda with this calculator?

Use Concentration Adjustment instead. Caustic strength is percent by weight, and caustic volumes do not add on mixing, so a gallon balance misleads. Enter the caustic's weight as the batch there; a mass balance is exact for weight percent.

How much concentrate does one full mix tank take?

Divide the tank's working volume by the dilution factor; the rest is water. A 500 gal tank at 4x takes 125 gal of concentrate and 375 gal of water. Enter 0 concentrate volume to get that recipe as the verdict.

Process Manufacturing calculator

Dilution Ratio Calculator

Find the water that turns a concentrate into a working solution, and check the batch fits your mix tank. You need both strengths on the same basis, the concentrate volume and the tank's working volume.

What this calculator does

Parts of water per part of concentrate for a target strength, plus the water to add, final volume and mix tank fit.

Formula used

Dilution factor = stock concentration ÷ target concentration
Dilution ratio (parts water per part concentrate) = dilution factor − 1
Final volume = concentrate volume × dilution factor; water to add = final volume − concentrate volume
Mix tank fill = final volume ÷ tank working volume × 100
Concentrate for a full tank = tank working volume ÷ dilution factor; the rest is water

Inputs explained

Stock Concentration: Concentrate strength from its label or certificate of analysis.
Target Concentration: Working strength your procedure or process spec calls for.
Concentrate Volume: Concentrate you plan to dilute, such as a drum or tote.
Mix Tank Working Volume: Usable volume of the mix tank up to its working level.

How to use the result

Best suited to making up working solution from drum concentrate, writing a mix tank batch sheet, checking a proportioner setting against target strength.
Weight percent strengths balance on mass, not gallons: use Concentration Adjustment with the stock's weight as the batch. Caustic and some other solutions shrink on mixing, so the true final volume is slightly less.

Current U.S. benchmarks

The producer price index for industrial chemicals stands at 336.006 (BLS, Aug 2026), up 13.3% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 14,543 chemical manufacturing establishments employing about 911,245 workers (Census County Business Patterns, 2023).

Common questions

Is a 1:3 dilution the same as a 4x dilution? Yes, in the parts form used here: 1 part concentrate plus 3 parts water, 4 parts in all, is a 4x dilution factor. Some specs write 1:4 for 1 part in 4 total, so confirm the form before you batch.
Do I add water to the concentrate or concentrate to the water? Add concentrate to water, slowly. Strong acids and caustic heat up as they dilute; add acid to water, never water to acid. Charge the water first where you can, and mix before sampling.
Can I dilute 50% caustic soda with this calculator? Use Concentration Adjustment instead. Caustic strength is percent by weight, and caustic volumes do not add on mixing, so a gallon balance misleads. Enter the caustic's weight as the batch there; a mass balance is exact for weight percent.
How much concentrate does one full mix tank take? Divide the tank's working volume by the dilution factor; the rest is water. A 500 gal tank at 4x takes 125 gal of concentrate and 375 gal of water. Enter 0 concentrate volume to get that recipe as the verdict.

Last reviewed 2026-10-01.